Fluid-pressure device



Dec. 11, 1923.

A. N. BESSESEN FLUID PRESSURE DEVICE Filed March 20, 1922 flrralewzr Patented Dec. 11, 1923.

UNITED STATES ALFRED N. BESSESEN, F MINNEAPOLIS, MINNESOTA.

FLUID-PRESSURE DEVICE.

Application filed March 20, 1922. Serial No. 545,247.

To all whom it may concern:

Be it known that I, ALFRED N. BESSESEN,

' a citizen of the United States, and a resident of Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in a Fluid Pressure Device, of which the following is a specification.

One object of my invention is to provide in a device of the kind described a leak proof pressure chamber.

Another object is to provide means for creating a high pressure in a leak proof chamber and maintaining it indefinitely.

Another object is to provide a device of the kind described which may be used directly as a syringe or as a pressure creating means connected with a separate syringe, or any other purpose for which a high fluid pressure device is adaptable.

With these and incidental objects in view, the invention consists of certain novel features of construction and combination of parts, the essential elements of which are hereinafter described with reference to the drawing which accompanies and forms a part of this specification.

In the drawing Figure 1 is a longitudinal section of my improved fluid pressure device, Figure 2 is a section taken on the line 2-2, Figure 1, Figure 3 is a section taken on the line 3-'3, Figure 1, and Figure 4 is a section taken on the line 4-4, Figure 1.

As shown in Figure 1, the barrel 1 has a threaded aperture 2 at one end thereof, to which may be connected a syringe needle or tube to which any desired device is connected. At its opposite end the barrel 1 receives on its exteriorly threaded portion the cylinder 3 which has its opposite end closed by the cap 4;.

Held by the adjacent ends of the barrel 1 and the cylinder 3 is a flexible diaphragm 5 having a bead 6 extending around its perimeter.

The iston 7 is mounted for reciprocal motion in the cylinder 3 and is feather-keyed thereto at 8. The rounded end 9 of the iston is adapted to carry the flexible iaphragm 5 which has sufiicient elasticity to allow the piston head to travel to the extreme end of the barrel 1 without rupturing the diaphragm.

The nut 10 is feather-keyed at 11 to the inner wall of the piston and engages with the screw 12 which is turned by means of a suitable handle 13.

The spring 14 is fastened at 15 to the rounded piston head and at 16 to the nut 10, and a pin 17 fastened at 18 to the rounded piston head extends into an axial aperture in the screw 12 as a guide for the screw.

For purposes of assembly and inspection I prefer to mak the cylinder 3 of two parts joined by thread engagement at 19.

A washer 20 of leather or any suitable flexible material is suitably held at 21 by an annular groove in the cylinder to prevent the flexible seal from being forced in between the outer wall of the piston and inner wall of the cylinder.

With the device as described it is evident that if the aperture 2 is closed and the barrel is filled with some fluid, a pressure can be created in the barrel 1 by turning the handle 13 to the right, and that this pressure will be limited only by the strength of the spring 14.

Furthermore, it is evident that when some of the fluid has been allowed to escape through the aperture 2 the piston head carrying the flexible diaphragm will move to the left under the influence of the spring 14 and maintain a high pressure, and that if the nut 10 has been screwed entirely down so as to put the full force of the spring on the piston head it will travel to the extreme end of the cylinder and create a considerable pressure at its exterior osition so as to expel substantially the last oFthe fluid in the bar'- rel 1 under a considerable pressure.

When the barrel has been emptied the piston head is retracted by turning the handle 13 to the left, the relation between the length of the screw, piston and spring being such that the spring will bring the piston head back to its normal position.

While I have described 111 invention and illustrated it in one particu ar design, I do not wish it understood that I limit myself to this construction, as it is evident that the application of the invention ma be varied in many ways within the scope o the following claims:

1. In a fluid pressure device the combination of a chamber, a cylinder joined to an open end of said chamber, a flexible seal interposed between said cylinder and said chamber, a piston having a rounded end adjacent to said seal mounted for reciprocal motion in said cylinder, a screw axially positioned within said cylinder, means extending outside of said cylinder for turning said screw, a nut co-acting with said screw, and

a resilient member extending between said nut and the head end of said piston.

2. In a fluid pressure device the combination of a chamber, a cylinder mounted on an open end of said chamber, a flexible seal inter sed between said cylinder and said cham er, a round headed piston reciprocally mounted in said cylinder and feather-keyed thereto, a nut mounted for reciprocal relation with said piston and feather-keyed thereto, a screw co-acting with said nut and having a portion thereof extending outside of said cylinder, a spring fastened to the head of said piston and to said nut, and means exterior of said cylinder for turning said screw.

' 3. In a fluid pressure device the combination of a pressure chamber having an aper ture at one end thereof, a cylinder mounted on the opposite end thereof, a flexible seal having a bead around its perimeter joined between said cylinder and said chamber, a round headed piston mounted for reciprocal motion within said cylinder and featherkeyed thereto, a nut mounted for reciprocal motion within said piston and feather-lmyetl thereto, a spring interposed between the inner surface of said piston and said nut and fastened to said nut and said piston. an axially positioned screw co'actinp with said nut, a cap for the open end of said cylinder, the said screw having a portion extending through said cap carrying, means thereon for turning said screw, and means on said screw for taking thrust thereof from either direction against said cap.

4. In a fluid pressure. device the combination of a pressure chamber having an aperture at one end thereof, a cylinder joined to the op osite end thereof, a flexible seal interposed tween said cylinder and said chamber, a piston mounted for reciprocal motion within said cylinder, spring means for exertingpressure on said piston and through said piston on said flexible seal, the proportions of said chamber, cylinder, piston and means being such that said spring means will normally hold said piston in its retracted pos tion.

ALFRED M. BESSESEN. 

